Pro HTML5 Programming (Professional Apress) by Peter Lubbers, Brian Albers, Frank Salim PDF

By Peter Lubbers, Brian Albers, Frank Salim

ISBN-10: 143023864X

ISBN-13: 9781430238645

HTML5 is right here, and with it, net functions have got strength, ease, scalability, and responsiveness like by no means ahead of. With this publication, builders will the right way to use the newest state-of-the-art HTML5 net technology—available within the most modern models of contemporary browsers—to construct net functions with unprecedented performance, pace, and responsiveness.
This re-creation comprises significant revisions for WebSockets performance, reflecting the recent W3C specification. It additionally positive factors new chapters overlaying the drag-and-drop API in addition to SVG.
Explains easy methods to create real-time HTML5 purposes that faucet the entire strength of recent browsers
Provides useful, real-world examples of HTML5 gains in action
Covers the entire new HTML5 APIs to get you up-to-speed fast with HTML5
Fully up-to-date to incorporate the most recent revisions of the WebSocket API, and masses more.
What you’ll learn
How the HTML5 specification has evolved
How to strengthen state-of-the-art net functions utilizing new HTML5 good points like WebSockets, geolocation, internet garage, Canvas, and audio/video
Which beneficial properties are available sleek browsers
Who this booklet is for
Web designers and builders who are looking to use the most recent state-of-the-art expertise on hand in present browsers
Developers who are looking to create dynamic, HTML5 internet applications
Developers who need to know which HTML5 positive aspects are supported by means of sleek browsers

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Extra info for Pro HTML5 Programming (Professional Apress)

Sample text

As usual, the working examples are available online for your download and perusal. Let’s start with the HTML elements declared in this example. For this display, the HTML consists of only a title, a canvas, and a button we can use to reset the heatmap. jpg applied to the canvas via CSS as shown in Listing 2-26. Listing 2-26. jpg"); } 55 CHAPTER 2  USING THE CANVAS API

Heatmap

We also declare some initial variables to be used later in the example.

Figure 2-6. A simple path of a tree canopy Working with Stroke Styles The Canvas API wouldn’t be powerful or popular if developers were stuck using simple stick drawings and black lines. Let’s use the stroke styling capabilities to make our canopy a little more tree-like. Listing 2-10 shows some basic commands that can modify the properties of the context in order to make the stroked shape look more appealing. Listing 2-10. stroke(); 34 CHAPTER 2  USING THE CANVAS API By adding the above properties before stroking, we change the appearance of any future stroked shapes—at least until we restore the context back to a previous state.

This function gives you a programmatic way to retrieve the current rendering data of a canvas in a text format, but in this case the format is a standard representation of the data that browsers can interpret as images. A data URL is a string containing the data of an image—such as a PNG—that a browser can display just like a normal image file. The format of a data URL is best illustrated with an example: data:image/png;base64, WCAYAAABkY9jZxn… This example shows that the format is the string data: followed by a MIME type (such as image/png), followed by a flag indicating whether or not the data is encoded in base64 format, and then the text representing the data itself.

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Pro HTML5 Programming (Professional Apress) by Peter Lubbers, Brian Albers, Frank Salim


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